Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9369632f9248989…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 21:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5739ad023fa3a98fd6b51ae3b0212011 SHA-1: e11feab926e6337b7951f048733d8d4184c06df2 SHA-256: d9369632f92489894595c1a1ed449cf5e31cf05fbf23e3e7f430a437316ade5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to function as a link farm, suggesting a phishing or malware distribution lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=dream+league+soccer+2019+mod+apk+free+download PDF link annotation
    • http://phamtrangia.site/upload/files/wetewaxabitowudowat.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/komujuwomedomagajosuk.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/jodemo.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kajalulubodemafudar.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fefuvod.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/waleziwogilufedowejet.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/babiwiwemixajasejujibuvuv.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/69957884883.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/47462339819.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vixezonapogimaw.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/31641235213.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zedepevovumu.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/xirutijafodosowuwogaxake.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/27272598942.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210901065251.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/35281727761.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/4663023254.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/gogeputuv.pdfIn PDF document text
    • http://upakuika.com/img/file/32352318694.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dogudeduleluropusowuro.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/79599078206.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0554e3797---legitavezanisozilokidula.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/wulovosedopuf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 17512 bytes
SHA-256: e255c46c01eab36eed9b0de26816395c164f230b1f17248844397f7182e836ce
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 11512 bytes
SHA-256: ebc4ec2507b47ca50fbf4a291ba4e83fb20f1d1d13c39f97bc3a600ce7a52717